Concrete mixing and distributing machine



Aug. 14, 1928.

E. O. HAMREN CONCRETE uxxme AND DISTRIBUTING MACHINE Filed Iarph 22 1926 Patented Aug. 14, 1928.

UNITED STATES 1,680,375 PAT NT O F E 1 ERIC 0. HAMREN, OF MILHA-UKEE, WISCONSIN, .ASSIGNOR TO CHAIN BELT COMPANY,

OF MILWAUKEE, WISCONSIN, A COETZORATION WISCONSIN.

CONCRETE MIXING AND DISTRIBUTING MACHINE.

Application filed March 22, 1926. Serial No. 96,578.

Paving machines such as are used in the construction of concrete roads usually consist of a portable motordriventruck a concrete mixer of the rotary drum type; a motor for driving the drum supported on the truck; a pivoted loading skip, constructed so that when lowered it may be conveniently filled with the coarse aggregates, and when elevated will charge the same into the mixing drum; an adjustable delivery chute; a horizontally swinging, and vertically adjustable, boom supported at the delivery end of the machine, and a bucket adapted to receive the mixed concrete from the drum and to traverse the boom so that such concrete may be delivered at the desired place on the roadway being constructed. Of course such machines embody many other features, but these are all that need be referred to for the purpose of understanding my invention.

The boom is usually many feet in length, and as the delivery bucket and the charge of concrete which it carries is very heavy,

a tremendous strain is placed upon the machine, tending to lift the end thereof to which is attached the charging skip, from the ground, as the'loaded bucket approaches the outer end of the boom, especially after the skip has been lowered and is resting upon the surface of the earth in position to receive the aggregates; and it sometimes happens that the truck at the charging end of the machine is actually lifted from the ground, a situation that is most undesirable, as will be readily understood.

' My present invention has for its object to utilize the weight of the charging skip and its load of aggregates to counterbalance the delivery bucket and its charge of mixed con crete as it is run out upon the boom for delivery; and this is accomplished by support ing the charging skip in its lowered position, upon a bumper or supporting bar carried by the truck or frame of the machine, so that the skip when in its lowered position to receive its charge does not rest upon the ground but its entire Weight is supported by the frame.

In the accompanying drawings: 7

Figure l is a diagrammatic side. elevation of a concrete paving machine to which my invention is applied.

Fig. 2 is an end view of the bumper or rest for the charging skip.

the line IV-IV of Fig. 3.

Referring to the drawings, A indicates the supporting frame or truck of they paving machine, it. being .mounted upon. a wheel or caterpillar tractor base. Bindicates therotary mixing drum, andG a. motor by which it is operated. C indicates the loading skip, F the delivery chute, E the distributing bucket into which the discharge chute delivers the mixed concrete from the drum B, and D the adjustable boom supported above the ground surface, along which the delivery bucket is traversed to deliver its charge at the place upon the street where the concrete is being placed. The usual mechanisms, for elevating the charging skip, so that it delivers the aggregates into th e mixing drum, and then loweringit to position to be again recharged; for tilting the discharge chute F back and forth from delivery to non-delivery position; for adjusting the boom both laterally and vertically, and for traversing the bucket backward and forward along the boom, are provided; but these are not illustrated since they may be of any usual or any preferred construction and form no part of my present invention.

The supporting frame or truck of the machine isprovided with a cross sill or bar 2, preferably of channel iron, located below the charging skip. Upon this cross piece is supported a bumper bar or rest, against which the skip bears when lowered to charging position, and by whichit is held with its bottomabove the surface of the ground, as represented in Fig. 1. rests upon springs 4, preferably two of them, which serve to cushion the skip as it descends, and are of a strength to resiliently sustain the loading skip and its full charge. The springs are supported in casings 5 formed with angular attaching, plates or brackets 8, adapted to be secured to the cross piece 2 and to hold the casings and the springs which they carry at the most de sirable angle for resiliently supporting the skip. The bumper bar is preferably of channel shape, as represented in Fig. 3, and overlies the open ends of the spring casings 5. It is guided in its movements by pins 6 secured. to the bar and passing through open The bumper bar ings in lugs 7 projecting from the spring casings 5.

liile my invention has been primarily devised with reference to application to a paving machine used in the construction of concrete reads, it will be understood that it is adapted for use in other apparatus where there is a mixing or agitating receptacle, provided at one end with a charging device and at its other end with a delivery bucket or equivalent holder to receive the material discharged from the receptacle and a boom extending away from the receptacle along which the delivery bucket may be moved to the point of discharge.

iVhat I claim is:

In a paving machine, the combination of a rotary concrete mixing drum, a portable frame supporting the drum, a charging skip for delivering material into the drum at one end, a bucket to receive the mixed concrete from the other end of the drum, an adjustable boom supported by the frame and extending away from the mixing drum above the surface of the ground along which the bucketmoves to the place of delivery, a cross piece extending across the frame below the charging skip, casings secured to the said cross piece, springs supported in the said casings; and a bar resting on the springs adapted to serve as a bun'iper for the charging skip when it moves to it-= lowermost position, and to hold it above but close to the surface of the ground, whereby it serves as a counterbalance to the boom and delivery bucket.

ERIC O. HAMREJ. 

